Basic Study of Susceptibility-Weighted Imaging at 1.5T
2008
SWith the aim of sequence optimization in susceptibility‑weighted imaging (SWI 2 image acquisition parameters (slice thickness and matrix size and 2 image processing conditions (number of slices per minimum intensity projection (MIP and Sliding Window were investigated using a 1.5‑T magnetic resonance imaging (MRI system. The subjects were 12 healthy volunteers and the target region for scanning was the whole brain. Informed consent was obtained from all subjects. First susceptibility‑ weighted images were acquired with various slice thicknesses from 1 mm to 5 mm and various matrix sizes from 256×256 to 512×512 and the images were assessed in terms of the contrast‑to‑noise ratio (CNR and were also visually evaluated by three radiologists. Then the number of slices per MIP and the usefulness of the Sliding Window were investigated. In the study of the optimal slice thick‑ ness and matrix size the results of visual evaluation suggested that a slice thickness of 3 mm and a matrix size of 448×448 are optimal while the results of evaluation based on CNR were not signifi‑ cant. As regards the image processing conditions the results suggested that the number of slices per MIP should be set to a minimum value of 2 and that the use of Sliding Window is effective. The pres‑ ent study provides useful reference data for optimizing SWI sequences.
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